Yes, it was a great fight, but with an extremely weakened and exceptionally stupid Superman, fighting batman who had years of preparation, a powered suit, lots of luck, and help. And even then batman was the one who "died".

But eh. It might be fun. But when you had Superman punching people through buildings in the first man of steel movie, it might be hard to accept batman getting punched and being ok with it. Unless he cheats.

So, Lex will be the villain and they have to introduce kryptonite.
As Mola points out, after finally getting a super powered superman its going to be pretty retarded if Batman actually fights him and doesn't get fucked up, fast.